Disk-sharpener



J. 1. SCHMIDT.

DISK SH ARPENER. l APPLICATION'FILED OCT. 22, 1918. RENEWEQ SEPT.29, 1919.v

1,339,043. j Patented May 4,1920.

WE'S. f a@ JACOB J'. SCHMIDT, OGEMA, SASKATCHEWAN, CANADA.v

msn-SHARPENER.

Specification of Letters Patent.

Patented May 4, 1920.

Application flled October 22, 1918, Serial No. 259,172. Renewed September 29, 1919. Serial No. 327,155.

To all 'whom t may concern:

Be it known thatI, JACOB J. Soni/Hur, a citizen of the United States, residing at Ogema, in the province of Saskatchewan and Dominion of Canada, have invented eertain new and useful Improvements in Disk- Sharpeners, of which the following is a specification.

lThis invention relates to grinding and polishing, and more especially to those machines which work on curved metal surfaces; and the object of the saine is to provide an attachment for a harrow orplow by means of which the disks may be sharpened.

While I have shown thedevice in its simplest form by holding lthe grinding stone against only a single disk, it will be obvious that it may be longer so that all of the disks on the machine may be treated at once; and

therefore one of the objects of my invention may be said to be the rapid sharpening of thedisks on a machine of this type without necessarily removing them ,fromv position.

Another object is to provide means whereby the grinders may be set at desired angles with respect to the several disks so that their edges may be ground as found necessar het another object is to press the grinders with yielding force toward the disks so that the operator is relieved of the necessity of watching all parts of the mechanism. Still other obj ects will appear inthe following specification and claims, and reference is made to the drawings, wherein- Figure l is a side elevation of this attachmentV at work.

Fig. 2 is a plan view of this lattachment in its simplest form, and shown at work on a single disk, and Fig. 8 is a section through the grind stone and its holder.

I have found it necessary to show only the frame F of the machine andone disk D, although many plows and harrows have a number of these disks arranged in what is sometimes called a gang. The disk in the present instance is supported at by means not necessary to describe, and the frame F is of angle iron. No novelty is claimed forV these features.

Coming now to the present invention, I provide a clamp for engagement with the frame. As herein shown, this consists of a hook 1 having a downturned bill 2 and a second hook 3 whose shank passes through the shank of the rst hook and whose bill 4 is upturned; while the shank of the second hook is vthreaded and receives a thumb nut as indicated at '5; This clamp as a whole willgrasp an angle iron frame F, or a frame of other structure, and when the nuts 5 are set up tight, the'several clamps (for I prefer touse at least two of them) will be kept in place as shown in Fig. 2. Through the outer ends of the hooks 1, passes a shaft 6 which may be held in the clamps or in one of them by means such as a thumb nut 7, this shaft standing parallel with the frame and overlying the support S for the disks D. It will be understood that this shaft is sufficiently long to extend across the entire gang of disks, although'in the further description, we will refer to but one.

Mounted on the shaft is a pair of collars 10 and 11, held adjustably by set screws 12. Revolubly mounted on thel shaft between these collars is thehead 13 of an arm 14, whose outer end is borne normally downward by a spring 15 coiled on the shaft and having one end engaging one set screw and the other end engaging the arm. Adjustably mounted on the arm under a set screw 16 is a block 17, to whose lower end a clamp is centrally attached by means of the pivot or screw 18. VThis clamp carries the grind stone. The number of said arms will correspond with the number of disks, one above each disk, and they are borne downward with yielding force which may be adjusted by loosening oneV of the collars 10 and turning it around the shaft 6 so that further strain will be put on the spring 15.

This grinder is indicated by the numeral 20. It is` usually a composition stone such 'as is provided for grinding disks, and is round and flat about as shown. The clamp for this stone may. be any which will answer, but I prefer to use a Hat bar 21 having 'a downturned lip 22 at one end to engage ene edge of the stone anda downturned foot 23 at the other end through which passes a set screw 24 engaging the otherY edge of ,the stone and bearing it toward said lip 'g while the center of the bar is engaged by the screw or pivot 18. This makes a very strong andyet light clamp foi` the stone into which the latter can be put and removed as in case a new stone is necessary or the old one should be reversed. The clamp may be held tightly or rotatably upon the screw. The size of parts is immaterial.

invention.

With this construction, when the main clamps are applied to the frame E and the arms set along the shaft in position to overlie the disks, the stones are inserted in the stone clamps when the arms are raised and the latter are then permitted to descend until the stones 2O lie on the disks. Ob-

viously, the blocks 17 linust be set at a` proper point on the arms and in such manner that the grinding faces of the stones will bear against the disks so as to grind them as desired, but this detail need not be amplified. The machine is now started either by drawing it along the road or field with its disks raised, or by rotating its disks without causing the machine to progress. The result is that the disks as they rotate are ground, the action being 'simultaneous and the pressure of the grinders upon the disks being regulated by the tension applied to the springs 15.

The foregoing description and the drawings have reference to what may be considered the preferred, or approved form of m It is to be understood that may make such changes in construction and arrangement and combination of parts, materials, dimensions, et cetera, as may prove expedient and fall-within the scope of the appended claims.

YHaving thus fully described my invention, what I claim as new and desire to secure by Letters Patent is zl. In a grinder for harrow disks, the comfbination with a clamp for engaging the frame of the harrow or the like, and a shaft carried by said clamp; of a collar on the shaft, an arm having a head which is revolubly mounted on the shaft adjacent the collar, a spring coiled on the shaft and having one end engaging the collar and the other the arm, a block adjustably mounted on said arm, a clamp carried by the block, and a grind stone carried by the clamp and borne against the disk. y

2. Ink a grinder for harrow disks, the combination with a clamp for engaging the frame of the harrowor the like, and a shaft carried by said4 clamp; of a collar on the shaft, an arm having va head which is revoluhly mounted on the shaft adjacent the collar, a spring coiled on the shaft and having one end engaging the collar and the other the arm, a block adjustable longitudinally and rotatablyon the arm, a bar carried by the lower end of said block and having a downturned lip at one end and a. downturned foot at the other, a grinder between said lip and foot, and a set screw through the foot and against the edge of the grinder.

3. In a disk Sharpener attachment for harrows and the like, the combination of a pair of clamps adapted to engage the har- Y harrows and the like, the combination of a pair. of clamps adapted to engage the han row frame,.a shaft mounted through said clamps, a pair of collars on the shaft, set screws forholding them in place, and a spring coiled on the shaft between the collars and havingA one end engaging the set screw of one collar; of an arm having a head rotatably mounted on the shaft between the s ring and the other collar, the other end o the' spring engaging said arm, a block mountedon the arm, a set screw for adjusting the block, and a clamp car-ried by the block Aand adapted to hold a grinder in position to grind the disk.

5. In a disk Sharpener attachment for harrows and the like, the combination of a pair of clamps adapted to engage the harrow frame, a shaft mounted through said clamps, a pair of collars on the shaft, set screws for holding them in place, and a spring coiled on the shaft between the collars, and having one end engaging the set screw of one collar; of an arm having a head rotatably mounted on the shaft between the spring and the other collar, the other end of the springengaging said arm, a block mounted on the arm', a set screw for permitting adjustment of the block, a clamp revolubly carried by the lower end of the block, and a disk-shaped grinding stone carried within the clamp and adapted tov be borne by the spring against the disk.

In-testimony whereof I afiix my signature in presence of two witnesses.

JACOB J. SOHNEIDT. Witnesses:

ANDREW OLSON OELLAND, CLARnNoE ELRQY HORNER. 

